Energy loss of protons in Zn: Measurements between 2 and 200 keV

Martínez-Tamayo, G.; Eckardt, J. C.; Lantschner, G. H.; Arista, N. R.

doi:10.1103/physreva.51.2285

Cited by 11 publications

(9 citation statements)

References 17 publications

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“…From the present data, no evidence for a deviation from this velocity proportionality towards lower velocities can be found within the experiments statistics. This indicates, that the contribution of the f-electrons to electronic stopping at these energies is negligible, which is also in accordance with earlier investigations for protons in Zn, for which the d-electrons with a binding energy of 8 eV also were not found to lead to a noticeable deviation from ε ~ v at low energies [55]. Thus electronic stopping at v < 1.a.u.…”

Section: Resultssupporting

confidence: 91%

Electronic stopping power of hydrogen in HfO2 at the stopping maximum and below

Primetzhofer

2014

Nuclear Instruments and Methods in Physics Research Section B:

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Electronic energy loss of hydrogen ions in HfO 2 was investigated in a wide energy range in the medium and low energy ion scattering regime. Experiments by Time-Of-Flight Medium-Energy Ion Scattering (TOF-MEIS) with proton and deuteron projectiles were performed in backscattering geometry for nm-films of HfO 2 on Si with an ultrathin SiO 2 interface layer prepared by ALD. At energies around the stopping maximum excellent agreement is found with earlier results from Behar et al. (Phys. Rev. A 80 (2009) 062901) and theoretical predictions. Towards lower energies discrepancies between experiment and calculations increase slightly. The low energy data exhibits excellent velocity proportionality and indicates the absence of clear effects due to distinct electronic states. Thus, also no apparent velocity threshold can be predicted within the experiments uncertainty from the present data. The magnitude of the energy loss is discussed in terms of a simple free-electron model and compared with the expected electron densities from plasmon frequencies.

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Section: Resultssupporting

confidence: 91%

Electronic stopping power of hydrogen in HfO2 at the stopping maximum and below

Primetzhofer

2014

Nuclear Instruments and Methods in Physics Research Section B:

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“…But in general, there is a rather good agreement with most of the experimental data in the whole energy range covered in our study. The behaviour around the stopping maximum is depicted in the insets of figure 2, where it can be seen that the agreement of our calculated stopping powers with the most recent experimental data [32][33][34][35][36][37][38][39][40][41][42] is particularly good. .…”

Section: Stopping Power Of Platinum and Gold For Protons And Alpha Pa...supporting

confidence: 78%

“…Discontinuous curves represent other results [28][29][30]43]. Experimental data are represented by letters [27] and symbols [32][33][34][35][36][37][38][39][40][41][42].…”

Section: Stopping Power Of Platinum and Gold For Protons And Alpha Pa...mentioning

confidence: 99%

Calculated energy loss of swift light ions in platinum and gold: importance of the target electronic excitation spectrum

Abril

Vera

García-Molina

2022

J. Phys.: Conf. Ser.

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Understanding and predicting the energy loss of swift ions in metals is important for many applications of charged particle beams, such as analysis and modification of materials, and recently for modelling metal nanoparticle radiosensitisation in ion beam cancer therapy. We have calculated the stopping power of the transition metals Pt and Au for protons and alpha particles in a wide energy range, using the dielectric formalism, which realistically accounts for the excitation spectrum of each metal through the Mermin Energy Loss Function - Generalised Oscillator Strength methodology. For each combination of projectile, energy and target, we have considered: (i) the equilibrium charge state of the projectile through the target, (ii) the energy-loss due to electron capture and loss processes, and (iii) the energy loss resulting from the polarisation of the projectile’s electronic cloud due to the self-induced electric field. Our calculated stopping powers show a fairly good agreement with the available experimental data for platinum and gold, particularly the most recent ones around the stopping power maximum, which validates the methodology we have used to be further extended to other transition metals. For the materials studied (platinum and gold), two commonly used and different sources of the experimental excitation spectrum yield comparable calculated stopping powers and mean excitation energies, the latter being closer to the most recent data provided in a recent ICRU Report than to previous compilations. Despite the small differences in the sources of excitation spectra of these metals, they lead to practically the same stopping power results as far as they reproduce the main excitation features of the material and fulfil physically motivated sum rules.

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“…It is worthwhile to mention that for ions heavier than Li, the experimental stopping power data are scarce except for some particular materials (C, Al, Si, Ag, Au) [3]. In zinc, no energy loss measurements for C and O ions have been reported in the literature.In previous papers, we have studied in a systematic way the stopping coefficients for a series of ions of increasing atomic numbers: H, He, Li, Be, and B in zinc [4][5][6][7][8], and with our theoretical formulation, we have been able to explain changes in the stopping power curves, reaching a very good agreement between the experimental and theoretical results. This agreement was achieved by a detailed theoretical study of the contribution of each individual charge state of the projectile and each electronic shell of the target.…”

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confidence: 60%

Experimental and theoretical study of the energy loss of C and O in Zn

et al. 2011

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We present a combined experimental-theoretical study of the energy loss of C and O ions in Zn in the energy range 50-1000 keV/amu. This contribution has a double purpose, experimental and theoretical. On the experimental side, we present stopping power measurements that fill a gap in the literature for these projectiletarget combinations and cover an extended energy range, including the stopping maximum. On the theoretical side, we make a quantitative test on the applicability of various theoretical approaches to calculate the energy loss of heavy swift ions in solids. The description is performed using different models for valence and inner-shell electrons: a nonperturbative scattering calculation based on the transport cross section formalism to describe the Zn valence electron contribution, and two different models for the inner-shell contribution: the shellwise local plasma approximation (SLPA) and the convolution approximation for swift particles (CasP). The experimental results indicate that C is the limit for the applicability of the SLPA approach, which previously was successfully applied to projectiles from H to B. We find that this model clearly overestimates the stopping data for O ions. The origin of these discrepancies is related to the perturbative approximation involved in the SLPA. This shortcoming has been solved by using the nonperturbative CasP results to describe the inner-shell contribution, which yields a very good agreement with the experiments for both C and O ions. The study of the energy loss of ions in solids is a problem of interest for basic and applied research in many areas, such as ion implantation, radiation damage, and space research. Although a large number of experiments and calculations have been produced over the years, there is a demand for new data for various projectile-target combinations. Additionally, the development of a consistent theoretical framework is a subject of great current interest [1,2]. In recent years, we have performed a set of studies that combine experimental and theoretical research with the aim of providing a theoretical framework that could serve as a basis for more accurate predictions of the energy loss of swift ions in various solid materials. It is worthwhile to mention that for ions heavier than Li, the experimental stopping power data are scarce except for some particular materials (C, Al, Si, Ag, Au) [3]. In zinc, no energy loss measurements for C and O ions have been reported in the literature.In previous papers, we have studied in a systematic way the stopping coefficients for a series of ions of increasing atomic numbers: H, He, Li, Be, and B in zinc [4][5][6][7][8], and with our theoretical formulation, we have been able to explain changes in the stopping power curves, reaching a very good agreement between the experimental and theoretical results. This agreement was achieved by a detailed theoretical study of the contribution of each individual charge state of the projectile and each electronic shell of the target. This was made by separ...

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Energy loss of protons in Zn: Measurements between 2 and 200 keV

Cited by 11 publications

References 17 publications

Electronic stopping power of hydrogen in HfO2 at the stopping maximum and below

Electronic stopping power of hydrogen in HfO2 at the stopping maximum and below

Calculated energy loss of swift light ions in platinum and gold: importance of the target electronic excitation spectrum

Experimental and theoretical study of the energy loss of C and O in Zn

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